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<p>The programmed cell death protein 1 (PD-1) / programmed death-ligand 1 (PD-L1) axis represents a cornerstone of cancer immunotherapy, yet the dynamic shuttling of PD-L1 between endosomal recycling and lysosomal degradation routes limits durable responses. Using a CRISPR screen targeting glycosphingolipid metabolism, we identify transmembrane 9 superfamily member 2 (TM9SF2) as a key regulator of PD-L1 levels. TM9SF2 orchestrates a dual mechanism: it recruits phosphoglycerate kinase 1 (PGK1) to promote PD-L1 recycling to the plasma membrane while dismantling the huntingtin-interacting protein 1-related protein (HIP1R)-mediated lysosomal degradation pathway. Genetic or pharmacological disruption of the TM9SF2-PGK1 complex depletes PD-L1 levels and boosts antitumor immunity. Further, the endogenous ceramide species Cer(d18:1/26:0) destabilizes this complex, triggering PD-L1 lysosomal destruction and potentiating antitumor immunity. These findings delineate a ceramide-gated sorting mechanism within the endosomal network, revealing a druggable metabolic switch to disrupt immune evasion and amplify checkpoint blockade efficacy.</p>

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Ceramide disrupts TM9SF2-PGK1 axis to redirect PD-L1 trafficking and enhance antitumor immunity

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月26日

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  • Yi Zheng,
  • Fan Yang,
  • Mengmeng Wang,
  • Zhiying Wang,
  • Xindan Zhang,
  • Chenxin Huo,
  • Yapeng Zhang,
  • Aiqing Nie,
  • Wenshuo Lyu,
  • Anran Dong,
  • Man Li,
  • Zhiyong Du,
  • Shenghao Zhou,
  • Luning Song,
  • Wenpeng Jiang,
  • Bowen Gu,
  • Wei Zhao,
  • Ting Dong

摘要

The programmed cell death protein 1 (PD-1) / programmed death-ligand 1 (PD-L1) axis represents a cornerstone of cancer immunotherapy, yet the dynamic shuttling of PD-L1 between endosomal recycling and lysosomal degradation routes limits durable responses. Using a CRISPR screen targeting glycosphingolipid metabolism, we identify transmembrane 9 superfamily member 2 (TM9SF2) as a key regulator of PD-L1 levels. TM9SF2 orchestrates a dual mechanism: it recruits phosphoglycerate kinase 1 (PGK1) to promote PD-L1 recycling to the plasma membrane while dismantling the huntingtin-interacting protein 1-related protein (HIP1R)-mediated lysosomal degradation pathway. Genetic or pharmacological disruption of the TM9SF2-PGK1 complex depletes PD-L1 levels and boosts antitumor immunity. Further, the endogenous ceramide species Cer(d18:1/26:0) destabilizes this complex, triggering PD-L1 lysosomal destruction and potentiating antitumor immunity. These findings delineate a ceramide-gated sorting mechanism within the endosomal network, revealing a druggable metabolic switch to disrupt immune evasion and amplify checkpoint blockade efficacy.